fix rain rendering and dynamic adjustments for already rendered areas

[Controllerdestiny]

Sourcery 总结

错误修复：

• 修正降雨渲染行为，并确保在已渲染区域中动态更新降雨。

Original summary in English

Sourcery 摘要

错误修复：

• 修复降雨渲染问题，并确保降雨量在已渲染区域中动态更新。

Original summary in English

Summary by Sourcery

Bug Fixes:

• Fix rain rendering and ensure rainfall updates dynamically in areas that have already been rendered.

[sourcery-ai]

你好——我已经审阅了你的更改，看起来很棒！

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Original comment in English

Hey - I've reviewed your changes and they look great!

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